15. A. using B. thinking C. trying D. practicing
14. A. Imagine B. Mind C. Do D. Think of
13. A. students B. children C. babies D. grown-ups
12. A. know B. remember C. understand D. think
11. A. happened B. know C. seemed D. felt
10. A. spelling B. grammar C. English D. pronunciation
9. A. From B. On C. Since D. After
8. A. make B. help C. let D. allow
7. A. knowledge B. time C. money D. English
6. A. found B. watched C. noticed D. known